How many atoms of silver are present in a 75-gram pure sample?

  1. 1.2×10⁻²⁴
  2. 1.34×10⁻²⁰
  3. 4.2×10²⁴
  4. 4.87×10²⁷

📝 Detailed explanation

Number of atoms = (75 ÷ 107.87) × 6.022×10²³ ≈ 4.2×10²⁴ atoms.
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